Vehicle brake



T.Y P. CHASE VEHICLE BRAKE May 10,A 1927.

Filed Maren 14. 1924 A [L/*Enar' E THr- RON F. CHASE Patented May I10,1927.

UNITED STATESl y 1,627,834 PATENT oFFl-CNE- THERON' IE.` CHASE, OFDAYTON, OHIO, ASSIGNOR TO GNRAL MOTORS CORPORATION,

OF DETROIT, MICHIGAN, A CORPORATION OFIDELAWARE.

VEHICLE BRAKE.

Application led March 14, 1924. Serial No.`699,252.

This invention relates to vehicles,'and is lllustrated as embodied 1n an'automoblle having a drlver-controlled servo-operated brake on eachdirigible front wheel, each brake being arranged to release its wheelautomatically when the wheel skids. An object of the invention is toprovide a compact and eiicient brake of this general character suitedforusc on automobiles manufactured in large-quantities. Having thisobjectin view, and to prevent any substantial increase in ypedalpressure in using four instead of two brakes, I arrange coaxial innerand outer drums to rotate with the wheel, one drum operating a -novelservo device for a brake member engageable with the other drum.Preferably the servo device engages' the inner drum, leaving therelatively large outer drum for the brake proper, to give a maximum areafor the braking friction.

In one desirable arrangement, the servo drum is in the form of a ioatingring fric-l tionally clutched to the wheel by centrifugal means, so thatif the wheel-skids the ring is freed and the pressure on the brake is.instantly and automatically relieved. Ing

the illustrated arrangement, the ring is fric tionally clutched tothewheel by .weights keyed to the wheel to rotate therewith, but free tomove radially under the influence of centrifugal. force to engage the'inside` of the ring.

ent from the following description of one ilp lustrative embodimentshown inthe accom- .panying drawings, in which:

Figure 1 is a vertical sectional, view of a dirigible Wheel of a vehiclewith the improved brakes; y

, Figure 2 is a sectional view -on the line 2 2 of Figure 1;

Figure 3 a device,

An important minor feature of the invenv detail View ofga of the' In thedrawings 10 indicates-a wheel having a hub 11 mounted upon a spindle 12with theusual antifriction bearings 13. Spindle 12 1sa part of asteering knuckle as shown and is mounted upon an axle 14 by means or'.

a yoke portion through which andy 4through the end of the axle extendsa.king

outer surfaces with friction material 31, and

are surrounded by and held in groove 23 by a ring 32 which is in turnheld by flanged plate'22 and may be chamfered or stepped upon its edgeto allow it to set down a short distance within groove 23. u This ring'32 is not fixed in any way but floats in the upper portion of thegroove.

l Carried by a flange 40 upon the spindle v12 is a brake support andcover 41, provided with two brake band supports 42 and 43 and -a boss 44through which extends the shaft 45 of a brake operating crank member 46connected to the band by a pin 46 and operable through the universaljoint 47, shaft '48, and lever 49.

Carried by the brake supports-42 and 43, are two brake bands and A66respectively. One of these, 65, is adapted to act upon ring 32 and theother, 66, upon drum 21. These two brake bands 65 and 66 are connectedto each other, the inner one 65, being adapted This is accomplished byconnecting one end of band 65k to`v 'an`end 71 of the x-band 66 throughlug 72, mounted thereon, and bolt 73 pivoted to the lug 72 and securedto end 70 of band 6 5. Band 65 is mounted in supf port' 42 in suchfashion as to permit some movement around the spindle. This movementwill tend toeexpand band 66 whose other end 74 is anchored 'as at 75.

Shaft 48 may be su ported 4in any suit'y able fashion but is pre erablyprovided with a hollcw end portieri Minto which extends wheel 10, as bbolts 20, is a..

ofI

eoL

to be actuated by the member 46 while the youter one 66 is actuated bythe inner.

il pin 51 mounted in one member 52 of the usual spring-supported chassisframe. The pinl is provided with an enlarged spherical head 53 slidablyfitting into hollow portion 50. Such an arran ement gives universalaction to the joint an also permits motion of the shaft lengthwise.v Thejoint may also be provided with a cover such as is proof joint.

The operation of the device is asifollows:

Assuming a rotation of the wheel clockwise (Figure 2), rapid movementtends to throw weights outward. and, through friction any surfaces 31,grip the inner surface -of ring 32. tighter the gripping action. Whenthis is ta ing place, if the b rake is to be applied, the'member 46 is'oerated to draw band 65 against yring 32. uch vactiori causes band to becarried around with the ring 32, Weights 30, and -wheel 10, .tending todrag with it band 66. The latter. being anchored at 75, expands againstdrum 21 and supplies -brakin effort to the wheel. When the wheel 32 andat slow slows, own the grip between ri weiglits 30 becomesl less tightan speeds will slip. 4

When 'at al standstill brake 66 may be applied by operating member 46 insame manner to gr1p ring 32. The latter, being ioating, will be rotatedwith little or no resistance and the end 71 of band 66 movd suiiicientlyto expand the latter against ldrum 21.

It will be noted that the vertical axis of universal joint 47 intersectsthe axis of the king pin at-an -acute angle.

pressure on the outer brake to guard against possibility of`locking bothfront wheels at that time. Y

While one illustrative embodiment ofthe invention has been described indetail, it is not my intention to limit its scope to that articularembodiment, or otherwise V,than y the terms' of the appended claims. l

I` claim: Y A 1. .A brake comprising, in combination, a drum, afloatingfring inside the drum, centrifugal means ictionally en aging thering to cause it to rotate with t e drum, a driver-controlled. servo-device arranged to engage and be operated'by the rin and a brake memberarranged to be-mov d b the serve device into ent with the m. A.

The more rapid the movement, thel y As is well" known, this causes anautomatic actlon 1n roundlng a corner, -serv'ing to relieveV the 2. 'Awheel having a brake comprising, in combination, a drum rotating wlththe wheel,

a floating rinor inside the drum, centrifufvally-operatef means rotatingwith the w eel and frictionally clutching the inside of' the ring, adriver-controlled servo device engageable with the outside of the ringand` permitted a limited angular movement with thewheel and ring, and abrake member ar' ranged to be moved by angular movement of the servodevice into frictional engage-l ment with the inside of the drum.

4. A Wheel having a brake comprising, inl combination, a drum rotatingwith the wheel, a floating ring inside of and coaxial with respect tothe drum, weights keyed to rotate with the wheel but permitted to movecentrifugally radially into clutching engagement with the inside of thering, a drlver-controlledservo device engageahle with the outside of thering and permitted an angular movement with the ring, and a brake membermoved by angular movement of the servo device into frictional retardingengagement withthe drum. y*

5. A wheel having a brake comprising, in

combination, coaxial inner andl outer drums rotating with the Wheel, aflexible friction servo band engageable with the outside of `the innerdrum, 'a friction brake bandanchoredat one end andexpansible to .engagethe inside of the .outer drum, a driver-o erated member connected to oneend of t e 'servo band to Vmove it into frictional engagement with drum,and `a connection between the other end of the servo band and .the freeend of the brake band.

6. wheel havin a brakevcomprising, in combination` coaxl mner and outerdums rotating with the wheel, a flexible friction being anchored at itsopposite end.

I ixmy' Signa'- testimony' 'whereof ture.

